Getting an error

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Using or at least trying to use the Tree View Widget obtained form the AppStore,  want to use this widget on a two entities model named ParenTable and ChildrenTable. When calling a page were the widget is configured, I am getting the following error message     After hours of research, I have not been able to find the reason for these error messages.  
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1 answers
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There is a demoproject available for this widget: https://appstore.home.mendix.com/link/app/295//TreeView-and-GridView-Demo-Project

A gut feeling about the error: did you make sure you passed an object? This looks like some null pointer exception.

Regards,

Ronald

 

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